Credits and data sources

Household Hazardous Waste Dropoff is built only from sources we're allowed to use. We do not copy listings from map apps, review sites, social networks, commercial recycling directories, stewardship-program locators or retail store finders.

Facility, event and program data

Government sources

Listings summarize facts (address, dates, hours, accepted materials, residency and appointment rules, fees) published by state, county and city agencies. Each listing links to its source page and shows when and how we last checked it. The official page — or the program itself — is always the final word.

Stores or private contractors appear only when a government agency lists that location as a public drop-off, and they are labelled as such. We never use a retailer's store locator.

OpenStreetMap

Base map data, and any OSM-derived listing, come from OpenStreetMap, © OpenStreetMap contributors, available under the Open Database License (ODbL) 1.0. Share-alike applies to the OSM-derived portion of our database. OSM-derived listings would be labelled “Source: OpenStreetMap” and link to the original OSM object; they are never marked as read from an official page. (As of this build, no listings are OSM-derived; see coverage.)

Geocoding

When a street address is matched to map coordinates we use the Nominatim geocoder (OpenStreetMap data, ODbL) and the U.S. Census Bureau Geocoder (public domain), with results cached in our repository. As of this build no address has been geocoded yet.

GeoNames

Approximate map pins (ZIP or city center), county names and ZIP/city search use GeoNames postal-code data, licensed CC BY 4.0, via the zipcodes-us npm package.

Metro list

The top-50 metro tracker on the coverage page uses the U.S. Census Bureau's Vintage 2024 Metropolitan Statistical Area population estimates (public domain).

Map

Maps use MapLibre GL JS (BSD-3-Clause) with free vector tiles from OpenFreeMap, using the OpenMapTiles schema and OpenStreetMap data. No API keys or paid map services. When a map loads, your browser requests tiles from OpenFreeMap (see the privacy policy).

Images

This site uses no photographs. The logo is an original SVG drawing. Any future image will be a public-domain US government work or a Creative Commons–licensed image, credited here and next to the image.

Official sources used in listings (493)

Software

Built with Astro (MIT) and designed to be hosted on Cloudflare Workers. Data validation uses Zod (MIT); legal pages are rendered with marked (MIT); PDF text extraction for source checks uses pdf.js (Apache-2.0).